/*
 Copyright (C) 2010 Kristian Duske

 This file is part of TrenchBroom.

 TrenchBroom is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 TrenchBroom is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with TrenchBroom. If not, see <http://www.gnu.org/licenses/>.
 */

#include "FourPaneMapView.h"

#include <QHBoxLayout>
#include <QSettings>

#include "ui/MapDocument.h"
#include "ui/MapView2D.h"
#include "ui/MapView3D.h"
#include "ui/QtUtils.h"
#include "ui/Splitter.h"

namespace tb::ui
{
FourPaneMapView::FourPaneMapView(
  MapDocument& document,
  MapViewToolBox& toolBox,
  render::MapRenderer& mapRenderer,
  GLContextManager& contextManager,
  QWidget* parent)
  : MultiPaneMapView{parent}
  , m_document{document}
{
  createGui(toolBox, mapRenderer, contextManager);
}

FourPaneMapView::~FourPaneMapView()
{
  saveWindowState(m_hSplitter);
  saveWindowState(m_leftVSplitter);
  saveWindowState(m_rightVSplitter);
}

void FourPaneMapView::createGui(
  MapViewToolBox& toolBox,
  render::MapRenderer& mapRenderer,
  GLContextManager& contextManager)
{
  m_hSplitter = new Splitter{DrawKnob::No};
  m_hSplitter->setObjectName("FourPaneMapView_HorizontalSplitter");

  m_leftVSplitter = new Splitter{Qt::Vertical, DrawKnob::No};
  m_leftVSplitter->setObjectName("FourPaneMapView_LeftVerticalSplitter");

  m_rightVSplitter = new Splitter{Qt::Vertical, DrawKnob::No};
  m_rightVSplitter->setObjectName("FourPaneMapView_RightVerticalSplitter");

  m_mapView3D = new MapView3D{m_document, toolBox, mapRenderer, contextManager};
  m_mapViewXY = new MapView2D{
    m_document, toolBox, mapRenderer, contextManager, MapView2D::ViewPlane::XY};
  m_mapViewXZ = new MapView2D{
    m_document, toolBox, mapRenderer, contextManager, MapView2D::ViewPlane::XZ};
  m_mapViewYZ = new MapView2D{
    m_document, toolBox, mapRenderer, contextManager, MapView2D::ViewPlane::YZ};

  m_mapView3D->linkCamera(m_linkHelper);
  m_mapViewXY->linkCamera(m_linkHelper);
  m_mapViewXZ->linkCamera(m_linkHelper);
  m_mapViewYZ->linkCamera(m_linkHelper);

  addMapView(m_mapView3D);
  addMapView(m_mapViewXY);
  addMapView(m_mapViewXZ);
  addMapView(m_mapViewYZ);

  // See comment in CyclingMapView::createGui
  auto* layout = new QHBoxLayout{};
  layout->setContentsMargins(0, 0, 0, 0);
  layout->setSpacing(0);
  setLayout(layout);
  layout->addWidget(m_hSplitter);

  // left and right columns
  m_hSplitter->addWidget(m_leftVSplitter);
  m_hSplitter->addWidget(m_rightVSplitter);

  // add children
  m_leftVSplitter->addWidget(m_mapView3D);
  m_leftVSplitter->addWidget(m_mapViewYZ);

  m_rightVSplitter->addWidget(m_mapViewXY);
  m_rightVSplitter->addWidget(m_mapViewXZ);

  // Configure minimum child sizes and initial splitter position at 50%
  m_mapView3D->setMinimumSize(100, 100);
  m_mapViewYZ->setMinimumSize(100, 100);
  m_mapViewXY->setMinimumSize(100, 100);
  m_mapViewXZ->setMinimumSize(100, 100);

  m_hSplitter->setSizes(QList<int>{1, 1});
  m_leftVSplitter->setSizes(QList<int>{1, 1});
  m_rightVSplitter->setSizes(QList<int>{1, 1});

  restoreWindowState(m_hSplitter);
  restoreWindowState(m_leftVSplitter);
  restoreWindowState(m_rightVSplitter);

  connect(
    m_leftVSplitter, &QSplitter::splitterMoved, this, &FourPaneMapView::onSplitterMoved);
  connect(
    m_rightVSplitter, &QSplitter::splitterMoved, this, &FourPaneMapView::onSplitterMoved);
}

void FourPaneMapView::onSplitterMoved(
  const int /* pos */, [[maybe_unused]] const int index)
{
  auto* moved = qobject_cast<QSplitter*>(QObject::sender());
  auto* other = (moved == m_leftVSplitter) ? m_rightVSplitter : m_leftVSplitter;

  contract_assert(index == 1);
  contract_assert(moved == m_leftVSplitter || moved == m_rightVSplitter);

  other->setSizes(moved->sizes());
}

void FourPaneMapView::maximizeView(MapView* view)
{
  contract_pre(
    view == m_mapView3D || view == m_mapViewXY || view == m_mapViewXZ
    || view == m_mapViewYZ);

  QWidget* viewAsWidget = dynamic_cast<MapViewBase*>(view);
  contract_assert(viewAsWidget != nullptr);

  const bool inLeft = m_leftVSplitter->isAncestorOf(viewAsWidget);
  if (inLeft)
  {
    m_rightVSplitter->hide();

    if (m_leftVSplitter->widget(0) == viewAsWidget)
    {
      m_leftVSplitter->widget(1)->hide();
    }
    else
    {
      m_leftVSplitter->widget(0)->hide();
    }
  }
  else
  {
    m_leftVSplitter->hide();

    if (m_rightVSplitter->widget(0) == viewAsWidget)
    {
      m_rightVSplitter->widget(1)->hide();
    }
    else
    {
      m_rightVSplitter->widget(0)->hide();
    }
  }
}

void FourPaneMapView::restoreViews()
{
  for (int i = 0; i < 2; ++i)
  {
    m_hSplitter->widget(i)->show();
    m_leftVSplitter->widget(i)->show();
    m_rightVSplitter->widget(i)->show();
  }
}

} // namespace tb::ui
